Move Singleton and related structs to namespace base

net/spdy/hpack/hpack_constants.cc

Index: net/spdy/hpack/hpack_constants.cc
diff --git a/net/spdy/hpack/hpack_constants.cc b/net/spdy/hpack/hpack_constants.cc
index 28385f9334ecdbf71309a2203a67c608299b6257..59a55dac96a537ad6532d38da349932f207cabaa 100644
--- a/net/spdy/hpack/hpack_constants.cc
+++ b/net/spdy/hpack/hpack_constants.cc
@@ -29,7 +29,7 @@ struct SharedHpackHuffmanTable {
   }
 
   static SharedHpackHuffmanTable* GetInstance() {
-    return Singleton<SharedHpackHuffmanTable>::get();
+    return base::Singleton<SharedHpackHuffmanTable>::get();
   }
 
   scoped_ptr<const HpackHuffmanTable> table;
@@ -48,7 +48,7 @@ struct SharedHpackStaticTable {
   }
 
   static SharedHpackStaticTable* GetInstance() {
-    return Singleton<SharedHpackStaticTable>::get();
+    return base::Singleton<SharedHpackStaticTable>::get();
   }
 
   scoped_ptr<const HpackStaticTable> table;